The psychometric properties and minimal clinically important difference for disability assessment using WHODAS 2.0 in critically ill patients

Objectives: The 12-item World Health Organization Disability Assessment Schedule 2.0 (WHODAS 2.0) provides a standardised method for measuring health and disability. This study aimed to determine its reliability, validity responsiveness establish the minimum clinically important difference (MCID) in critically ill patients. Design: Prospective, multicentre cohort study. Setting: Intensive care units of six metropolitan hospitals. Participants: Adults mechanically ventilated > 24 hours. Main outcome measures: Reliability was assessed by internal consistency. Construct comparing WHODAS scores at 6 months with EuroQoL visual analogue scale (EQ VAS) Lawton Instrumental Activities Daily Living (IADL) scores. Responsiveness evaluated assessing change over time, effect sizes, percentage patients showing no change. MCID calculated using both anchor distribution-based methods triangulation results. results: A baseline 6-month score were available 448 demonstrated good correlation between items evidence item redundancy. Cronbach α coefficient 0.91 average split-half 0.91. There moderate EQ VAS (r = 0.72; P < 0.001) IADL 0.66; months. sizes from 3 low. Ceiling effects not present floor only. final estimate 10%. Conclusion: is reliable, valid responsive measure disability total 10% represents MCID.